Updating bootstrap for site to latest patch version 4.6.x

docs/css/greenmail.css

@@ -30,7 +30,7 @@ section {
     margin-top: -60px;
 }
 
-.bs-docs-masthead, .bs-docs-header {
+.bs-docs-header {
     background-color: #009688;
     color: white;
     background-image: -webkit-gradient(linear, left top, left bottom, from(#009688), to(#7AC293));
@@ -49,18 +49,13 @@ section {
     padding: 0.1rem 0.5rem;
 }
 
-.bs-docs-sidebar.affix {
-    margin-top: 40px;
-}
-
 .nav-pills.nav-link.active, .nav-pills .nav-link.active, .nav-pills .show > .nav-link {
     background-color: inherit;
     font-weight: bold;
     color: #00796B;
 }
 
-.back-to-top:hover,
-.bs-docs-theme-toggle:hover {
+.back-to-top:hover {
     color: #009688;
 }
 

docs/index.html

@@ -10,8 +10,8 @@
     <title>GreenMail</title>
 
     <!-- Bootstrap core CSS -->
-    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected].0/dist/css/bootstrap.min.css"
-          integrity="sha384-B0vP5xmATw1+K9KRQjQERJvTumQW0nPEzvF6L/Z6nronJ3oUOFUFpCjEUQouq2+l" crossorigin="anonymous">
+    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected].2/dist/css/bootstrap.min.css"
+          integrity="sha384-xOolHFLEh07PJGoPkLv1IbcEPTNtaed2xpHsD9ESMhqIYd0nLMwNLD69Npy4HI+N" crossorigin="anonymous">
 
     <!-- Custom styles for this template -->
     <link href="css/prism.css" rel="stylesheet"/>
@@ -1612,8 +1612,8 @@ <h4 id="download_archive" class="anchor">Older versions</h4>
 <script src="https://code.jquery.com/jquery-3.5.1.slim.min.js"
         integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj"
         crossorigin="anonymous"></script>
-<script src="https://cdn.jsdelivr.net/npm/[email protected].0/dist/js/bootstrap.bundle.min.js"
-        integrity="sha384-Piv4xVNRyMGpqkS2by6br4gNJ7DXjqk09RmUpJ8jgGtD7zP9yug3goQfGII0yAns"
+<script src="https://cdn.jsdelivr.net/npm/[email protected].2/dist/js/bootstrap.bundle.min.js"
+        integrity="sha384-Fy6S3B9q64WdZWQUiU+q4/2Lc9npb8tCaSX9FK7E8HnRr0Jz8D6OP9dO5Vg3Q9ct"
         crossorigin="anonymous"></script>
 
 <script src="js/prism.min.js"></script>